Endress+Hauser Proline 100 Modbus RS485 Brief Operating Instructions page 16

Electrical connection
NOTICE
In systems without potential matching, the multiple grounding of the cable shield causes
mains frequency equalizing currents!
Damage to the bus cable shield.
‣
Only ground the bus cable shield to either the local ground or the protective ground at one
end.
5.1.6 Preparing the measuring device
NOTICE
Insufficient sealing of the housing!
Operational reliability of the measuring device could be compromised.
‣
Use suitable cable glands corresponding to the degree of protection.
1. Remove dummy plug if present.
2. If the measuring device is supplied without cable glands:
Provide suitable cable gland for corresponding connecting cable.
3. If the measuring device is supplied with cable glands:
Observe requirements for connecting cables →  11.
16
Proline 100 Modbus RS485
Endress+Hauser